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Q.

The relative atomic mass of naturally occurring element is not a whole number due to _____?

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a

Element has isotope

b

Element is radio-active

c

some mass is lost in the formation of nucleus

d

Mass of electrons is included

answer is A.

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Detailed Solution

Various elements corresponds with different isotopes where each isotope has different percentage of natural abundance. If an element has naturally occurring isotopes, its relative atomic mass can be computed using the measured atomic mass values and the relative abundance of each isotope.

Therefore, atomic mass is not obtained in whole number because elements corresponds to isotopes.

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The relative atomic mass of naturally occurring element is not a whole number due to _____?